Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 2
Interest cost	6	6
Expected return on plan assets	(9)	(10)
Net amortization	(1)	(2)
Net periodic benefit cost	(3)	(4)
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	3	3
Expected return on plan assets	(4)	(5)
Net amortization	0	0
Net periodic benefit cost	(1)	(2)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	23	27
Expected return on plan assets	(35)	(38)
Net amortization	9	9
Net periodic benefit cost	0	2
UNITED STATES | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	9	11
Expected return on plan assets	(14)	(17)
Net amortization	5	3
Net periodic benefit cost	$ 0	$ (3)